Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
11-07-2011, 11:35 AM   #1
Junior Member




Join Date: Oct 2011
Posts: 37
sears 135mm macro lens disassembly

I picked this lens up last week, forgot to check aperture function and of course its stuck. Picked up a can of brake parts cleaner and the screw drivers last night. I have this torn down and did not lose the ball bearing or any other screw I read about. I have it torn down to the point where I cant see any more screw to remove. I think I am close to the aperture ring but cant get it torn down further anyone know where I need to go from here? I will say this is easier than watch repair. They are a real pain, and a lot cleaner than Harleys. But I cant find any manuals on line and dont really want to bother a repair shop just yet. I will post a pic of where I am at in a sec.

11-07-2011, 11:42 AM   #2
Junior Member




Join Date: Oct 2011
Posts: 37
Original Poster
well photos will have to wait, as usual wifey has "put stuff up" and I have no idea where.
11-07-2011, 03:37 PM   #3
krp
Veteran Member




Join Date: Oct 2010
Location: Illinois
Photos: Gallery
Posts: 470
I have the same problem as you, except mine is a non-macro. (I also have a macro version that works fine) It seems like the aperture blades are inside a metal piece that's either glued or cemented together. I haven't been able to figure out how to get it open. But hopefully someone else knows how to access the blades.
11-07-2011, 04:31 PM   #4
Site Supporter
Site Supporter
Just1MoreDave's Avatar

Join Date: Feb 2007
Location: Aurora, CO
Photos: Gallery | Albums
Posts: 6,331
I had this lens (non-macro) maybe three years ago so I'm a little fuzzy on the exact details. I started from the front. I took off the "name" trim ring just like a Takumar, but I can't remember if that was necessary. Eventually the whole filter ring/front barrel unscrews. I know I removed the three front elements but again, I don't know if I needed to. I can't remembder doing anything with the focus ring; it must have come off easily.

I believe the rear elements come out in a tube assembly with spanner slots; the whole tube unscrews. The mount and aperture lever come off by just removing the screws you see.

What I remember is, that still wasn't enough to get to the blades. There was an aluminum tube at the center of the lens with 3 or 4 holes in it, maybe 1/4" in diameter. I could access small slotted screws through that and get the lens apart further. I think they used that trick a couple of times. I eventually got an assembly of the six aperture blades and a spring completely off the lens, about silver-dollar size. I soaked the whole thing in mineral spirits overnight, let it dry and that was enough.

11-07-2011, 11:31 PM   #5
Junior Member




Join Date: Oct 2011
Posts: 37
Original Poster
Thanks for the help with this. My K5 showed up today right before heading off to work so I am a little distracted and will be a couple days before I get back to the Sears lens.
01-10-2012, 10:33 PM   #6
Senior Member
pezmaker's Avatar

Join Date: Jul 2011
Location: Madison, WI
Photos: Gallery | Albums
Posts: 276
Time to revive an old thread. I've got the vivitar branded version of the non-macro, I think the same as what you're describing. mount came off with 4 screws, rear element came out easy, just rotated a metal tube off. Focus ring came off with a piece of glass still in it, two elements and two metal placing rings came out, but that's all I got. now what. How to get to the aperture blades? I don't see spanner slots, I don't see anymore screws, I don't see an obvious piece to unscrew.

Also... uh, anyone have a diagram of the elements? I, uh, well, when i pulled the focus ring out, the two inner lenses popped out and I don't know the orientation...

The lens is identical to the one in this review:
https://www.pentaxforums.com/userreviews/sears-135mm-f2-8-auto-multicoated.html

Last edited by pezmaker; 01-10-2012 at 10:45 PM.
01-11-2012, 12:43 AM   #7
Junior Member




Join Date: Oct 2011
Posts: 37
Original Poster
Sorry cant help you, I will not be going into lens repair any time soon

Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
aperture, cant, k-mount, lens, pentax lens, repair, screw, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale - Sold: Manual Sears 135mm f2.8, Sears 80 - 200mm f4.0 Macro, Takumar Asahi 28-8 (Worl vytas Sold Items 5 10-08-2010 04:13 AM
SEARS 1:2.8 f=135mm macro lens question luma Pentax SLR Lens Discussion 2 04-25-2010 07:14 AM
For Sale - Sold: Sigma 28-80mm F3.5-5.6 Mini-Zoom Macro & Sears 135mm F2.8 Macro MF lens DaveInPA Sold Items 3 01-08-2010 05:38 PM
For Sale - Sold: Sears 135mm f:2.8 Macro Telephoto Lens mycarsoots Sold Items 3 02-18-2009 04:48 PM



All times are GMT -7. The time now is 02:19 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top